Morpheous issue: flashing lock screen for micro seconds while adding forum

Scenario 1
1.Login as an instructor and click on forums
2. Create a forum and add a topic
3. Click on the topic in the forum
4. We could see flashing lock screen for micro seconds while we open a topic in the forum

Scenario 2
1.Login as an instructor and click on forums
2. Create a forum and add a topic
3. Click on the topic in the forum
4. Click start new converation-> add data-> click on post

Note: working fine Mac

Please find attached video

http://www.screencast.com/t/R2T9NcKE